How to Treat the Decolorizer of Chemical Plant Wastewater

How to Treat the Decolorizer of Chemical Plant Wastewater

Chemical plants, during the production process, generate wastewater with complex compositions and varied colors due to numerous intricate chemical reactions. The sources of these colors are diverse, including pigments inherent in chemical raw materials, colored intermediates or products formed during reactions, and various chemical additives added to facilitate the reactions. If these colored wastewater are discharged without effective treatment, they will not only severely affect the appearance of water bodies but also obstruct light penetration in water, disrupting the normal photosynthesis of aquatic organisms, thereby causing significant damage to the entire aquatic ecosystem

In this context, decolorizing agents for chemical plant wastewater have become the key to solving the color problem. From a principle perspective, flocculation-based decolorizing agents, such as polyaluminum chloride and polyacrylamide, form positively charged multon complexes through hydrolysis. These complexes then undergo electro-neutralization with negatively charged dye colloidal particles. At the same time, they utilize adsorption bridging to promote the aggregation of these dispersed particles into larger flocs. Subsequently, these flocs are separated from the wastewater through sedimentation or filtration, achieving efficient decolorization.

Adsorbent decolorizers are typically represented by activated carbon. Activated carbon boasts an extremely rich microporous structure and possesses a vast specific surface area. When treating wastewater from chemical plants, it adsorbs pigments in the wastewater through physical adsorption, relying on van der Waals forces between molecules to firmly attach the pigment molecules to its surface, thereby significantly reducing the color intensity of the wastewater. Activated carbon demonstrates excellent adsorption performance for various types of pigments and is widely used in the field of wastewater decolorization

Oxidizing decolorizers work with strong oxidants, such as ozone and hydrogen peroxide. Taking ozone as an example, it has extremely strong oxidizing properties that can react with pigment molecules in wastewater, disrupting their conjugated double bond structure. Since the conjugated double bond is a key factor in the color of pigment molecules, as the double bond is broken, the chromophoric groups of the pigment molecules disappear, and thus the color of the wastewater fades

Using chemical plant wastewater decolorizing agents has significant advantages. It can efficiently reduce the color of wastewater, ensuring that treated wastewater meets stringent discharge standards, greatly reducing environmental pollution. The operation process is relatively simple; it only requires adjusting the dosage of decolorizing agents and reaction conditions based on the actual water quality and color levels of the wastewater.

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